The TV series made its debut in 1965 and ran for only three years. Still, it is a fondly remembered bit of nostalgia from the "fun" Sixties, perpetually re-run in syndication (where I eventually saw it).
Many years later, Bill Mumy himself ("Will Robinson" from the TV series) wrote a series of comic-books about his TV family. This was published by Innovation. His opus, Voyage To The Bottom Of The Soul featured art by Michael Dutkiewicz. The story was a serious take on the Robinsons and featured the wedding of Judy and Don, along with various other events. It is very well done and in lieu of any real closure to the TV series the closest we will ever get to seeing whatever happened to the Robinsons and Dr. Smith.
If you can find a copy of this book I enthusiastically recommend it! In the meantime, here is a video montage of some wild Lost in Space scenes. It really was like a comic-book come to life!